JPS584021Y2 - Wet flashback prevention device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wet-type flashback prevention device used in a fuel gas supply path such as a gas welding or chemical reaction window. The purpose is to ensure that backfires can be prevented.

In the conventional type, the fuel gas is simply passed through the water seal when it flows forward, and the flashback flame is simply blocked by the water seal when the fuel gas flows back due to backfire, which has the following drawbacks.

(a) If the downstream gas becomes open bubbles within the water seal, flashback cannot be blocked.

For this reason, the supply pressure and supply amount of the fuel gas are low enough to prevent continuous bubbles from occurring, and the flashback prevention ability is poor.

(b) When a flashback occurs, the explosive pressure causes the sealed water to flow back into the fuel gas supply path, damaging the supply path and equipment interposed therein.

(c) During flashback explosion, sealing water flows out to the outside, so it is necessary to refill it with water when reusing it.

(d) When the water injection starts to become insufficient due to consumption, the fuel gas becomes open bubbles within the water seal or is not sealed at all, making it impossible to prevent backfire.

In order to eliminate the above-mentioned drawbacks, the present invention is designed so that when the fuel gas flows forward, it passes through the water seal and also passes through a flame extinguisher made of porous material.In the event of a backfire, the flame extinguisher can shut off the backfire and seal the water. This is to block backflow.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a vertical cylindrical sealed container, and a flame extinguishing tube 3 made of porous sintered metal is partitioned and sealed in the lower center of the backfire prevention chamber 2 in the container 1. fixed in shape.

The flame-extinguishing tube 3 divides the flashback prevention chamber 2 into an inlet chamber 4 and an outlet chamber 5.

A water seal 6 is accommodated in the entire inlet chamber 4 and in the intermediate height portion of the outlet chamber 5.

A porous air/water separator plate 7 is stretched across the outlet chamber 5 above the water seal 6.

A fuel gas introduction pipe 8 is connected to the upper part of the inlet chamber 4 within the water seal 6 .

A fuel gas outlet pipe is connected to the upper part of the outlet chamber 5 outside the water seal.

The fuel gas outlet pipe 9 penetrates the inside of the container 1, has a ventilation hole 18 in the middle thereof, has a check valve 10 interposed in its protruding left end 9a, and has a safety valve 11 in its protruded right end 9b. It will be decorated.

In the figure, 12a is a fuel gas supply pipe on the inlet side, 12b is a fuel gas supply pipe on the outlet side, 13 is a safety rupture disc, 14 is a water test pipe, 15 is a water supply valve, and 16.17 is a drain valve.

Next, to explain its function, the forward-flowing fuel gas enters the inlet chamber 4 from the supply pipe 12a through the introduction pipe 8, and enters the inlet chamber 4.
The water passes through the water, becomes bubbles, floats in the sealed water 6, and is sent out from the outlet chamber 5 through the outlet pipe 9 to the supply pipe 12b.

At the time of flashback, the flashback flow flows from the supply pipe 12b to the outlet pipe 9.
The check valve 10 is closed at the point where the water flows into the outlet pipe 9 to prevent it from flowing back into the outlet pipe 9.

At this time, if the backfire flow passes through the check valve 10 and enters the outlet pipe 9, the safety valve 11 opens and flows out into the atmosphere from here.

Furthermore, if the flashback reaches the exit chamber 5, the explosion pressure causes the rupture disc 13 to burst, and the flashback explosion pressure escapes into the atmosphere and does not enter the entrance chamber 4.

FIGS. 3 and 4 show a part of the above embodiment modified as follows.

That is, the flame extinguishing cylinder 3 is located above the water seal 6 and the steam/water separation plate 7, a plurality of small ones 3a are used, and the outlet 19 of the introduction pipe 8 is formed in a downward porous shape.

In this case, it is also conceivable to submerge a plurality of small flame extinguishing tubes 3a under water under the steam/water separation plate 7.

Since the present invention is configured as described above, it has the following effects.

(a) If the downstream gas becomes open bubbles within the water seal, the flame extinguisher will extinguish the backfire.

Therefore, the supply pressure and amount of fuel gas can be set to a high pressure and amount that can generate open bubbles, and the flashback prevention ability can be greatly improved.

(b) In the event of a backfire, the extinguisher absorbs the explosive pressure, preventing the sealing water from flowing back forcefully into the fuel gas supply path, and causing damage to the supply path and equipment intervening therein. can be eliminated.

(c) Since the flame extinguishing tool prevents the seal water from flowing out to the outside in the event of a flashback explosion, the trouble of refilling the seal water when reusing is saved.

(d) Even if the sealed water starts to run out due to consumption, it is safe because the flame extinguisher will surely extinguish the backfire.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical cross-sectional plan view, FIG. 2 is a partially cutaway view taken along line II-II in FIG. 1, FIG. 3 is a vertical cross-sectional front view of another embodiment, and FIG. is a sectional view taken along line IVIV in FIG. 3. 1...Airtight container, 2...Backfire prevention chamber,
3... Flame extinguishing tool made of porous material, 3a... Plural cylinders, 4... Entrance chamber, 5... Outlet chamber, 6... ... Water sealing, 8 ... Fuel gas introduction path, 9 ... Fuel gas outlet path.

Claims (1)

[Scope of utility model registration request] 1. A flame extinguishing device 3 made of a porous material is provided in sections within a flashback prevention chamber 2 in a sealed container 1, and the flame extinguishing device 3 divides the flashback prevention chamber 2 into an inlet chamber 4 and an outlet chamber 5. A water seal 6 is housed in the bottom of the chamber 4, a fuel gas inlet passage 8 is communicated with the inlet chamber 4 within the seal 6, and a fuel gas outlet passage 9 is communicated with the outlet chamber 5 outside the seal 6. Features wet flashback prevention device. 2. Scope of Utility Model Registration The wet flashback prevention device described in claim 1, in which the flame extinguisher 3 is immersed in the water seal. 3. Scope of Utility Model Registration The wet flashback prevention device described in claim 1, in which the flame extinguisher 3 is located within a water seal. 4. Scope of Utility Model Registration Claims Paragraph 1, Paragraph 2, or Paragraph 3
In the wet type flashback prevention device described in 1., the flame extinguisher 3 consists of a plurality of cylindrical bodies 3a.